你的这句有点怪啊,可以该成:
Enjoying your life and understanding the true meaning of life, and the most important thing is happiness
而that is 的表达应该是:
that is(to say)也就是说,意思是”即”
例如:
He will come on National Day, that is (to say), October 1st. 他国庆节,即十月一日来.
Enjoying your life and understanding the true meaning of life, and the most important thing is happiness .
Enjoying your life and understanding the true meaning of life, that is(that is(to say)也就是说,意思是”即”), the most important thing is happiness
……that is the most important thing,it is happiness
去掉things的s